Pestle and mortar for dental use



(No Model.)

P. E. HANSEN.

PESTLE AND MORTAR FOR DENTAL USE.

No. 462,703. Patented Nov. 10, 1891.

vwwcoz 01 W at mam Q/Vihwooeo STATES PATENT OFFICE.

FLORIAN E. HANSEN, OF MINNEAPOLIS, MINNESOTA.

PESTLE AND MORTAR FOR DENTAL USE.

SPECIFICATION forming part of Letters Patent No. 462,703, dated November10, 1891.

Application filed June 26, 1891.

To aZZ whom it may cmwern:

Be it known that I, FLORIAN E. HANSEN,- a citizen of the United Statesof America, residing at Minneapolis, in the county of Hennepin and Stateof Minnesota, have invented certain new and useful Improvements inPestles and Mortars for Dental Use; and I do declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which itappertains to make and usethe same, reference being had to the accompanying drawings, and to theletters and figures of reference marked thereon, which form a part ofthis specification.

My invention has relation to improvements in pestles and mortars; andthe object is to provide an improved mortar for reducing or trituratingamalgams or plastic materials, such as are used in the profession or artof dentistry. So far as I am aware, the amalgams and plastics used inthe filling of teeth are reduced simply by manipulation in the palm ofthe hand or by common hand-mortar and pestle. This, while in a measureeffectual, is not satisfactory or complete, and I have devised thepresent invention, consisting of a mortar of particular construction,adapted especially for dentists use, and have also invented a revolvingpestle to be used in the mortar.

My invention therefore consistsin the novelty of the parts and theiroperative combination, as will be hereinafter specified, andparticularly pointed out in the claims.

I have fully and clearly illustrated my invention in the accompanyingdrawings, wherein- Figure 1 is a View of the pestle in position in themortar and the stem of the pestle attached to the end of the flexibleshaft of a dental engine. Fig. 2 is a perspective of the pestle. Fig. 3is a perspective View of the mortar, showing the concave or saucer inthe side; and Fig.4 is a view of the mortar, showing a tray formed inthe side.

A designates the pestle, the bulb or grind-. ing portion 1 of which maybe extended beyond a semisphere to afford more grindingsurface when inthe mortar. In the shank of the pestle is fixed a shaft 2, the upper end3 being formed to couple with the flexible shaft of a dental engine orother rotating means Serial No. 397,597. (No model.)

for revolving the pestle. The bulb of the pestle may be made ofWedgewood, glass, or any suitable material, and when made of glass thegrinding-surface should be ground in order to obtain the requisite bitein use.

B designates the mortar, the bowl4: of which is made somewhat flaring,in order that when the pestle is inserted for use the largest possiblegrinding-surface may be presented or utilized between the mortar andpestle. One side of the mortar is formed concave, constituting a shallowsaucer 5 for use in dentistry, instead of separate implements of thatkind usually employed, and in the bottom or one of the sides of themotar is also formed a tray 6, for holding such materials as may bedesired or requisite, so that the mortar may not only be used for thatparticular purpose, but in a single implement the uses of threeimplements are attained or accomplished.

In use or operation the stem or mandrel of .the pestle is connected tothe hand-piece of the dental engine, the material placed in the mortar,and then the pestle applied and being rotated through its connection tothe dental engine the trituration of the material is thoroughlyaccomplished. At the same time that the pestle is grinding in the mortarthe latter may be turned by the hand in opposite direction and thedesired result more quickly attained. I thus not only provide anefficient and simple means for grinding or triturating the material, butsave both time and laborin the operation.

Having thus described my invention, whatI claim, and desire to secure byLetters Patent, 1s

1. The combination, with a mortar, of a hand-pestle provided with acoupling-stem, and a flexible rotatable shaft connected to the stem,substantially as and for the p urpose set forth.

2. The mortar herein described, consisting of a rectangular body havinga mortar-bowl formed therein, a saucer formed in one side of the body,and a tray formed in one of the other sides, substantially as described.

In testimony whereof Iafiix my signature in presence of two witnesses.

FLORIAN E. HANSEN.

\Vitnesses:

NEWTON T. HUME, XVILLIAM H. DAVIES.

